Check out this sneak peek clip of
"True Tori's" next new episode, titled "The Truth Comes Out." In the clip, Dean McDermott's friend asks him why Dean cheated, which has now put his entire life into a tailspin and is jeopardizing everything he holds dear.

"Because I didn't think I would get caught," says McDermott. "I was drinking and using drugs, man. I was not dealing with things that happened to me in the past. It's not like I was looking for sex or was horny or anything. T and I, our relationship, our sex life, is solid. I have a brain that wants to kill me, I have a brain that wants me dead. That's how the alcoholic mind works and thinks."

He concludes, "I am on the verge of losing everything that means anything to me in this world, my wife and my family."

Will Dean be able to get help and repair his relationship with wife Tori Spelling? Tune in Tuesdays at 10 p.m. ET/PT on Lifetime to find out.